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I've dipped my toes into using OpenGL and Go a few times and it seems pretty nice. But I'm entry level graphics programming and so it scares me off to go further (surely someone would have used Go by now in a 3d game, if you can do Minecraft on the JVM, why not Go)?

I keep wondering if it's not possible or if there's just not a lot of overlap between Go programmers and gamedevs? Wish someone knew.

I wouldn't predict a lot of overlap. On the game dev side, Go offers nothing new, and the forced untuneable gc will be an instant turnoff for the usual reasons. On the Go side, my outside perspective is most of its users seem to be focused on web server backends, trying to justify async everywhere, and/or rewriting slow Python or Perl or Bash scripts and assuming that makes it a systems language.

Go users interested in diving in to SDL or OpenGL bindings to make a game shouldn't be discouraged. Lots of games are made in all sorts of high level languages, the heavy lifting is put onto a few native libraries. But if the goal is to make a general engine, I'd question its utility apart from fun/learning. Again there are game engines in high level languages (with dark native-level secrets in any that try to be performant) but they don't seem to get traction. Even an engine in e.g. C++ doesn't necessarily help your performance goals (http://www.yosoygames.com.ar/wp/2013/11/on-mike-actons-revie...) if your plan is to make it general instead of make it just support whatever sorts of games you're making and planning to make.

The vast majority of memory in a modern game stores data for the GPU. On a game console the game manages this data itself. If you ever want to ship on a console you better be sure Go can handle the memory visible from the GPU correctly e.g. keep the necessary alignment, ensure the GPU is not reading/writing the memory it's going to modify, do not charge address of anything, preserve layout of structures etc. I never used Go so I don't know if it already does this. But I would be considering these things way before I'd even started looking into performance.